Blog site ‘disappeared’ after uploading photos – theme-related?

I finally tried the photo upload feature below the blog editor. The initial error generated told me where the upload was supposed to (trying to) go: …/public_html/wp-content/uploads/2008/01 Long story – short: I had to create ‘uploads, 2008, 01’ folders, and give Write and Execute properties to those folders, AND all the way back up to the top parent folder – just to upload photos.

OK, uploading finally worked. Making thumbnails worked. Everything worked! But going to view my site afterward displays a blank page only – no background, title, content – nothing!

Since I still had ‘backoffice’ access in WordPress, I thought ‘why not change the theme – what else could “wipe out” my site?’ Clicking on the Presentation tab, and the Themes subtab now yields this result:

Warning: array_keys() [function.array-keys]: The first argument should be an array in /home/internat/public_html/wp-includes/theme.php on line 277

…and there is no theme showing in the main window as the Current Theme, nor are there any other themes listed in Available Themes (I have 10 or so loaded in my Themes folder on the server). It’s as if the wrong folder is being read to create the array value?

Any help is appreciated, as my site is “down” (blank) until this is resolved. I’m not PHP-literate.